There are 6 Disney owned hotels all of which are in walking distance of the parks. They all have shuttle buses as well apart from
Disneyland Hotel which is right at the entrance to the parks. Santa Fe and Cheyenne which have already been mentioned are the cheapest of these. If booked through Disney the price will also include park tickets for all days including arrival and departure days - so 2 nights will have 3 days tickets.
Apart from the disney hotels there are 4 good neighbour hotels which are very close - Dream Castle, Kyriad, Magic Circus and Explorers. They are all next to each other and have a free shuttle bus to the parks. They can be booked through Disney with tickets included or can be booked direct but that price probably wont include tickets
There are also hotels in the nearby town - Val d"Europe and Bussy St George. Both of these are on the man RER train line which has a station at Disneyland - 1 /2 stops down the line and will cost about 2 Euros per trip or there is a bus service as well